To travel between solar systems, a spacecraft would need extremely sophisticated – if not impossible – technology.

Actual science finds itself badly outnumbered by entertainment repackaged as factual. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. This ...

A physicist has argued that fundamental cosmic constraints make visits from alien civilizations to Earth effectively impossible. Factors such as vast interstellar distances, the speed of light as a ...

Physicist Richard Feynman argued that fundamental limits of physics, biology, and time make interstellar contact between civilizations effectively impossible. He cited vast distances, the speed of ...

The universe is vast and teeming with stars – but if intelligent life exists, it may not be able to visit Earth. By Kai James / The Conversation Published May 27, 2026 8:00 AM EDT This article was ...